Hi.

While trying to get Linux (2.4.19-rmk7-pxa2 and 2.6.7-mm7) start with a ramdisk on a xm250 board, i discovered, that uboot 1.1.1 seems to have a problem passing the ATAGs to the kernel.

Here is some debug output with linux 2.6.7-mm7

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u-Boot 1.1.1 (Jul 28 2004 - 17:11:18)

U-Boot code: A3F80000 -> A3F998AC BSS: -> A3F9DBD8 RAM Configuration: Bank #0: a0000000 64 MB Bank #1: a4000000 0 kB Bank #2: a8000000 0 kB Bank #3: ac000000 0 kB Flash: 32 MB In: serial Out: serial Err: serial Hit any key to stop autoboot: 3  2  1  0 Using MAC Address 00:40:42:01:65:AA BOOTP broadcast 1 got BOOTP packet (src=67, dst=68, len=300 want_len=300) Filtering pkt = 0 Bootfile: uImage [BOOTP] Checking extension (300 bytes)... [BOOTP] Processing extension 1... (4 bytes) [BOOTP] Processing extension 3... (4 bytes) [BOOTP] Processing extension 6... (4 bytes) [BOOTP] Processing extension 15... (16 bytes) [BOOTP] Processing extension 28... (4 bytes) [BOOTP] Received fields: NetOurSubnetMask : 255.255.255.0 NetOurGatewayIP : 192.168.0.1 Got good BOOTP TFTP from server 192.168.0.1; our IP address is 192.168.0.3 Filename 'uImage'. Load address: 0xa3000000 Loading: *T ################################################################# ################################################################# ########################### done Bytes transferred = 799312 (c3250 hex) ## Booting image at a3000000 ... Image Name: Linux-Image Created: 2004-07-28 18:10:20 UTC Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 799248 Bytes = 780.5 kB Load Address: a0200000 Entry Point: a0200000 Verifying Checksum ... OK OK ## Loading Ramdisk Image at 00200000 ... Image Name: initrd Created: 2004-07-27 16:09:34 UTC Image Type: ARM Linux RAMDisk Image (gzip compressed) Data Size: 2517544 Bytes = 2.4 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Initrd at 00200040. Size 2517544## Transferring control to Linux (at address a0200000) ... ## setup_start_tag ## setup_memory_tags start a0000000 size:04000000 ## setup_commandling_tag size:0000001c line: root=/dev/ram0 init=/linuxrc ## setup_initrd_args start:00200040, end:00466a68 ## setup_end_tag

Starting kernel ...

Uncompressing Linux......................................................... done, booting the kernel. Linux version 2.6.7-mm7 (chrkap@allesodernix) (gcc version 3.3.3) #21 Wed Jul 28 18:10:04 UTC 2004 CPU: XScale-PXA255 [69052d06] revision 6 (ARMv5TE) CPU: D undefined 5 cache CPU: I cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets CPU: D cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets Machine: Intel DBPXA250 Development Platform (aka Lubbock) parse_tags number of tags: 5 parsing tag: 0x54410001 parse_tag: tag 0x54410001 parse_tag_core parsing tag: 0x54410002 parse_tag: tag 0x54410002 parse_tag_mem32 start 0xa0000000 size 0x01000000 Memory policy: ECC disabled, Data cache writeback Memory clock: 99.53MHz (*27) Run Mode clock: 398.13MHz (*4) Turbo Mode clock: 398.13MHz (*1.0, inactive) On node 0 totalpages: 4096 DMA zone: 4096 pages, LIFO batch:1 Normal zone: 0 pages, LIFO batch:1 HighMem zone: 0 pages, LIFO batch:1 Built 1 zonelists Kernel command line: root=/dev/ram console=ttyS0,115200 PID hash table entries: 128 (order 7: 1024 bytes) Console: colour dummy device 80x30 Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory: 16MB = 16MB total Memory: 14376KB available (1366K code, 346K data, 76K init) Calibrating delay loop... 397.31 BogoMIPS Mount-cache hash table entries: 512 (order: 0, 4096 bytes) CPU: Testing write buffer coherency: ok NET: Registered protocol family 16 NetWinder Floating Point Emulator V0.97 (double precision) ttyS0 at MMIO 0x40100000 (irq = 15) is a FFUART ttyS1 at MMIO 0x40200000 (irq = 14) is a BTUART ttyS2 at MMIO 0x40700000 (irq = 13) is a STUART RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize Using anticipatory io scheduler physmap flash device: 4000000 at 0 cfi_cmdset_0001: Erase suspend on write enabled Using buffer write method cmdlinepart partition parsing not available RedBoot partition parsing not available pxa2xx_udc: version 14-Dec-2003 usb0: Ethernet Gadget, version: St Patrick's Day 2004 usb0: using pxa2xx_udc, OUT ep2out-bulk IN ep1in-bulk usb0: MAC 1a:60:19:07:1a:f0 mice: PS/2 mouse device common for all mice NET: Registered protocol family 2 IP: routing cache hash table of 512 buckets, 4Kbytes TCP: Hash tables configured (established 1024 bind 2048) NET: Registered protocol family 1 Kernel panic: VFS: Unable to mount root fs on unknown-block(1,0) ====

It seems that the kernel recieves all tags u-boot provided, but not all are parsed. Which seems strange, since none of the parse_tag_* functions in arch/arm/kernel/setup.c which are called by parse_tags(), can return something other than 0 which means that parse_tags() should read the next tag wich it doesn't.

Has anybody experienced something simmilar, is this a known issue?